Biddle 210415_UG 电路图.pdf

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1、AVTM21-415Ja Rev A June 2005 15 kV Megohmmeter Test Set Catalog No. 210415 Series High-Voltage Equipment Read the entire manual before operating. Aparato de Alto Voltaje Antes de operar este producto lea este manual enteramente. 2621 Van Buren Avenue Norristown, PA 19403 1-800-723-2861 ext. 8578 Rad

2、ioFans.CN 收音机爱 好者资料库 15 kV Megohmmeter Test Set Catalog No. 210415 Series M RadioFans.CN 收音机爱 好者资料库 Copyright 1989-2005 by Megger. All rights reserved. The information presented in this manual is believed to be adequate for the intended use of the product. If the product or its individual instrument

3、s are used for purposes other than those specified herein, confirmation of their validity and suitability must be obtained from Megger. Specifications are subject to change without notice. M Valley Forge Corporate Center 2621 Van Buren Avenue Norristown, PA 19403-2329 USA Tel: 610-676-8500 Fax: 610-

4、676-8610 RadioFans.CN 收音机爱 好者资料库 i AVTM21-415Ja Rev. A June 2005 Table of Contents 1 INTRODUCTION.1 2 SAFETY PRECAUTIONS.3 3 RECEIVING INSTRUCTIONS.5 4 SPECIFICATIONS.7 5 DESCRIPTION.13 6 CONTROL 50 Hz, reduced rating Basis of Rated Performance: 230 Volt 60 Hz supply with stabilizer out. M 8 AVTM21-

5、415Ja Rev. A June 2005 OUTPUT TEST VOLTAGE: 0-15 kV dc, negative with respect to ground. OUTPUT CURRENT: With Stabilizer Out at 60 Hz: 2 mA continuous; 5 mA for 12 minutes. at 50 Hz: 1.67 mA continuous; 4.17 mA for 12 minutes. With Stabilizer In at 50 or 60 Hz: At 15 kV, 50 A continuous. Short Circu

6、it: 12 mA maximum, limited by circuit breaker. RIPPLE VOLTAGE (rms) 1% at 3 M resistive load OUTPUT VOLTAGE REGULATION: Internal Stabilizer Out: 13% no load to 7.5 M load % percent change in line voltage Internal Stabilizer In: 0.1% no load to 300 M load including 10% line voltage change METERING: K

7、ilovoltmeter: 4 inch (11.4 cm) Taut-Band. 3 color-coded scales: 0-7.5 kV (red), 0-15 kV (black) and 0- 1.5 reference (green). Accuracy: 2% full scale. Megohmmeter: 4 inch (11.4 cm) Taut-Band. 2 scales: 1-100 Megohms (red), 2-200 Megohms (black). Accuracy: 2% of full scale length at any marking, bett

8、er near high resistance end. Ranges: 8 ranges, 4 per scale, as described in following Table. SPECIFICATIONS 9 AVTM21-415Ja Rev. A June 2005 MEGOHMMETER SPAN, MEGOHMS VOLTMETER RANGE SETTING VOLTAGE kV RANGE SWITCH at x 1 RANGE SWITCH at x 10 RANGE SWITCH at x 100 RANGE SWITCH at x 1K 15 10 2-200 20-

9、2000 200- 20,000 2000- 200,000 7.5 5 1-100 10-1000 100- 10,000 1000- 100,000 EITHER ANY up to 300 up to 3000 up to 30,000 up to 300,000 CONTROLS Power OFF-ON switch (Circuit Breaker) with green lamp indicator. High Voltage OFF-ON switch (Circuit Breaker) with red lamp indicator. Voltage control with

10、 Zero-Start interlock, 0-100 reference dial. Stabilizer selector switch: IN-OUT. Voltmeter Range Switch: 7.5-15 kV. Megohmmeter multiplier switch, 4-position: x1, x10, x100, x1K M 10 AVTM21-415Ja Rev. A June 2005 CABLES AND CONNECTORS Input Cable: Attached; 5 feet (1.5 meters), 3-wire with plug. Out

11、put Cable: Attached; shielded with GUARD terminal, high voltage clip and boot; 15 feet (4.6 meters) long. Ground Cable: Separate, 10 feet (3.3 meters) with positive action clamp at outboard end. Ground Terminal: inch stud with wing nut. External Instrument Jack: Accepts -inch 2-wire phone plug for c

12、onnecting external recorder or current meter to read current in test item. PHYSICAL Case: High-impact structural foam, polycarbonate plastic with metal control panel and removable hinged lid Size: Overall Width Depth Height 20 1/8 12 13 inches 52 20.5 33 cm Weight: Cat. No. 210415: 35 lbs. (15.9 kg)

13、 Cat. No. 210415-47: 37 lbs. (16.8 kg) Instruction Card: Permanently attached inside lid. Cable R4 and R5 for X10; R4, R5, R6 and R7 for X100. No shunt is used for X1K range. In series with M102 is a two-wire phone jack J1 that is shorted unless a plug is inserted. For use see Section 9. For the use

14、 and significance of the guard see Sections 9 and 10. The Test Set is energized directly by W1 with the green wire tied directly to the panel to provide a panel ground. The white neutral wire is uninterrupted and is considered the return path for the Test Set supply. The black wire is considered hot

15、 and power is fed to the set via the CB1 circuit breaker that also is DESCRIPTION 15 AVTM21-415Ja Rev. A June 2005 used as the power-on switch. When power is available and CB1 is closed the green ac ON lamp comes on. The path is interrupted by the contact of K2. Moving the voltage control T1 to zero

16、 closes the contacts of the zero start switch. This action applies the line voltage to the coil of K2 and ultimately to T1. The red HIGH VOLTAGE ON lamp lights since it parallels the coil of K2. Relay K2 will now remain closed even if the voltage control is advanced off its zero position. The line v

17、oltage is fed to T1 through the stabilization selector switch S1, directly when S1 is closed in the OUT position. Raising the voltage control now applies a controlled voltage to the primary of T101 through the trip coil of circuit breaker switch CB2. When S1 is set to the IN position (stabilized) vo

18、ltage is applied to T1 through resistor R1 and a parallel path exists from the input of T1 to the circuit return through the back-to- back connected Zener diodes CR1 and CR2. These diodes clip the peaks of the voltage across T1 so that any transient changes in the line supply voltage do not change t

19、he crest amplitude. This stabilizes the output voltage as long as the load current does not exceed 50 A. The 50 A limit is equivalent to 300 Megohms at 15 kV. Power Supply Option Test sets equipped with the -47 optional input differ from standard sets in that separate step-down transformers T2 and T

20、3 are included between the power source and the Test Set. The nominal line voltage is specified at purchase. Transformers are located in the cover of the Test Set. Optional output voltages may be selected in accordance with the table on the schematic Figure 2. M 16 AVTM21-415Ja Rev. A June 2005 Figu

21、re 2: Schematic Diagram of the 15 kV Megohmmeter 17 AVTM21-415Ja Rev. A June 2005 6 CONTROL references listed in Sections 9 and 10. Place guard connections on the terminals if a guarded test is required. (See Sections 8 and 9). Set up barriers or use other means to keep unauthorized personnel away f

22、rom all high voltage terminals of the complete test arrangement. SELECTION OF LOCATION Select a location for the Test Set which meets the following conditions: 1. The operating area must be as dry as possible. M 20 AVTM21-415Ja Rev. A June 2005 2. The Test Set must be within 10 feet of the high-volt

23、age terminal of the apparatus to be tested. NOTE: For operator safety, the output cable should be fully extended to provide maximum distance between the operator and the high-voltage terminal. 3. A reliable ground connection must be within 12 feet of the Test Set. 4. If an electrical service outlet

24、is not within range of the 5 ft. input cable, a UL-approved extension cord rated for 15 amperes (minimum) and not longer than 50 feet may be used. 5. The operator of the Test Set must be able to conduct the test without being exposed to traffic hazard; he must have free access to all controls and be

25、 able to read the meters and panel markings easily without approaching energized high-voltage terminals. CONNECTIONS PROCEDURE 1. Connect the Test Set ground lead to the panel and to the local ground. G CAUTION For safe operation this separate ground cable must be used. The green wire of the input c

26、able provides a parallel path but cannot be relied on to provide an adequate ground path for the panel. 2. Connect the output cable clip to the high-voltage terminal of the apparatus to be tested. (See below under Clearances.) 3. If guard is not in use the output cable shield must not be grounded. G

27、rounding this shield will short-circuit the megohmmeter; the set, therefore, will not register a resistance measurement. SETTING UP 21 AVTM21-415Ja Rev. A June 2005 4. If a guarded test is to be run, connect the guard lead of the apparatus to be tested to the shield of the output cable. (See Section

28、s 8 and 9.) Insulate the guard circuit from ground. 5. With the Test Set switch OFF, connect the input cable to the service outlet. CLEARANCES Be sure adequate clearances are maintained between energized conductors and ground to prevent arc-over. Such accidental arc-over may create a safety hazard o

29、r damage the equipment being tested. The position of the exposed conductors with respect to ground can often be maintained by tying the conductors in place with clean, dry nylon rope. Table I lists the minimum air clearances that must be maintained and also suggests the minimum path length along a r

30、ope if it is tied directly to a conductor. Finally, the table indicates minimum personnel clearances (based on OSHA specifications) that will limit the danger of static induced voltages being developed on nearby insulated objects, including people. TABLE 1: Minimum Air Clearances Voltage of Test Dir

31、ect Air Path (inches) Path Along Dry Nylon Rope (inches) Minimum Personnel Clearances (feet) 5 kV 0.5 1-1/8 2 10 kV 1.0 2-1/4 2 15 kV 1.5 4 2 30 kV 4.0 10 2.4 After completion, make a careful review of the test setup. Tests can then be conducted per Section 8. For convenience a condensed operating p

32、rocedure is given on the Instruction Card. M 22 AVTM21-415Ja Rev. A June 2005 POWER SUPPLY OPTION, Catalog No. 210415-47 When this option is supplied, Megger recommends that the service supply be limited by an appropriate line fuse to provide protection in case of a malfunction of the stepdown trans

33、former. Providing this protection is the responsibility of the user. A fuse of not less than 1 amperes or more than 3 amperes is recommended. Because of the many different service sockets in general use, the input cable has been provided with a plug for which adaptors are readily available. If use o

34、f an adaptor is not desirable, the plug supplied can be cut off and replaced with one best suited to the service conditions. The green lead of the input cable is to be connected to ground, the white lead to the supply neutral, and the black lead to the hot portion of the line. SETTING UP 23 AVTM21-4

35、15Ja Rev. A June 2005 Figure 4: Testing in a Substation. M 24 AVTM21-415Ja Rev. A June 2005 Figure 5: Testing Parking Lot Lighting; the Test Set Shown is Operating from an Inverter. SETTING UP 25 AVTM21-415Ja Rev. A June 2005 Figure 6: Testing Transformer Terminals M 26 AVTM21-415Ja Rev. A June 2005

36、 Figure 7: DC Motor Test Setup. Figure 8: Generator Test Setup. 27 AVTM21-415Ja Rev. A June 2005 8 OPERATION Before conducting a test, consult Section 2 for Safety, Section 7 for Setting Up and Section 10 for Test Theory. When the Test Set and apparatus are set up as indicated in Section 7, the equi

37、pment can be energized and the necessary test performed by following the steps listed below. TEST PROCEDURE 1. Remove all safety grounds from the Apparatus to be tested. 2. Close the AC ON switch; green lamp comes on.* * If the service outlet voltage exceeds the rated limit for the Test Set the Powe

38、r ON indicator will be abnormally bright. This will warn and alert the operator to stop the procedure and correct the problem. 3. Close the OUTPUT ON switch. 4. Set the voltmeter range switch to desired range. 5. Set megohm MULTIPLIER switch to X1 range. 6. Set stabilizer to OUT position. 7. Firmly

39、move voltage control to zero; red lamp comes on. 8. Turn voltage control clockwise to increase output voltage as required for test being conducted. M 28 AVTM21-415Ja Rev. A June 2005 9. Note voltage, resistance, and time as required by the test procedure being followed. Make settings and take readin

40、gs as described in steps below. 10. If indicated resistance fluctuates during the reading the stabilizing switch may be set to the IN position (see Section 9). 11. To measure insulation resistance at 10 kV, set the voltmeter range switch to 15 kV and set the voltage to exactly 10 kV. Read the upper

41、black scale. Read the resistance in megohms on the upper black scale of the megohmmeter. Multiply value read by multiplier to which the megohmmeter range switch is set (i.e. by 1, 10, 100 or 1000; see Section 9). 12. To measure insulation resistance at 5 kV, set the voltmeter range switch to 7.5 kV

42、and set the output voltage to exactly 5 kV. Use the lower red meter scale. Read the megohmmeter lower red scale and multiply the value by the megohmmeter RANGE SWITCH setting. 13. To measure insulation resistance at voltages other than 5 or 10 kV: a. Read megohms on the scale corresponding to the vo

43、ltmeter range, matching red (inner) scales and black (outer) scales. b. Multiply by the megohmmeter range setting. c. Multiply by the reading from the voltmeter lower green scale. (See Megohm Readings, for explanation). BREAKDOWN OF TEST ITEM In the event of failure of the apparatus being tested, th

44、e Test Set circuit breakers will trip out within twenty (20) seconds. When the stabilizer is in use trip-out may not occur but the OPERATION 29 AVTM21-415Ja Rev. A June 2005 output current is limited to 7.5 mA. When such a trip-out occurs, before approaching the equipment, apply the grounding stick

45、to the high voltage terminal to discharge the test setup as all stored energy may not be dissipated by such a failure. NORMAL SHUTDOWN PROCEDURE When the test has been completed, follow this shutdown procedure: 1. Set the voltage control to zero. 2. Open the AC ON switch or the OUTPUT ON switch or b

46、oth. 3. When the voltmeter indicates that voltage has decreased to a value of less than half the voltage used during the test, use an insulated grounding stick to apply a direct short circuit to all ungrounded terminals of the apparatus being tested. 4. Disconnect cables in the following sequence; f

47、irst, the input cable; second, the output cable (including the guard if in use), finally, the ground cable. 5. Apply ground bonds to the equipment that has been disconnected. INTERRUPTING A TEST At any time, the AC ON or HV ON switches can be opened manually to interrupt a test, provided that the grounding stick is applied afterward to discharge any stored energy as described in the normal shutdown procedure. For any circumstances requiring that a test be